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As An Interstellar Gas Cloud Shrinks In Size, Its Gravitational Potential Energy

The video shows a collapsing cloud of interstellar gas, which is held together by the mutual gravitational attraction of all the atoms and molecules that make up the cloud. (as the cloud shrinks in size, its gravitational potential energy decreases. Because energy cannot simply disappear, the lost gravitational potential energy must be. As an interstellar gas cloud shrinks in size, its gravitational potential energy: